US3637530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistor composition
Assignee: Johnson Matthey PLC
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Filing: 1970-02-10
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Granted: 1972-01-25
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Expires: 1990-02-10
Abstract
Abstract A resistor composition in the form of an oxide containing niobium and ruthenium in which the atomic ratio of metal to oxygen is 1:2 and in which the atomic ratio of niobium to ruthenium is within the range of 1:2000 to 1:1.
Inventors
- 👤 Mira E A Casale
- 👤 Owen N Collier
- 👤 Gerald S Iles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:20
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06533; H01C17/0654; H01B; H01B1/00; H01B1/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
53 words
A resistor composition suitable for firing on to a nonconducting substrate to form a resistor element, the composition consisting essentially of oxygen, niobium and ruthenium in which the atomic ratio of metal to oxygen is 1:2 and in which the atomic ratio of niobium to ruthenium is within the range 1:2,000 to 1:1.
Claim 2
Dependent Claim
22 words
A resistor composition according to claim 2 wherein the atomic ratio of niobium to ruthenium is within the range 1:1,110 to 1:4.
Claim 3
Dependent Claim
20 words
A resistor composition according to claim 3 wherein the atomic ratio of niobium to ruthenium is within the range 1:320.
Claim 4
Dependent Claim
14 words
A resistor composition according to claim 1 including from 90-20 weight percent of glass.
Claim 5
Dependent Claim
46 words
A resistor composition according to claim 1 including a metal precursor which decomposes on heating to produce a metal selected from the group consisting of silver, gold and platinum and thereby assists in controlling the electrical characteristics of a resistor element made from the said composition.
Claim 6
Dependent Claim
19 words
A resistor composition according to claim 6 wherein the metal precursor is a silver oxide or a silver carbonate.
Claim 7
Dependent Claim
25 words
A resistor composition according to claim 6 wherein the said metal is present in an amount up to 75 weight percent of the total composition.
References Cited (Backward Citations)
US3256700A
Cited
US3352797A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |